What do you think about this code snippet?
/**
* Bitmask of states
*/
export const enum ViewState {
FirstCheck = 1 << 0, // result is 1
ChecksEnabled = 1 << 1, // result is 2
Errored = 1 << 2, // result is 4
Destroyed = 1 << 3 // result is 8
}
I'm curious why the integer results were not explicitly stated as numbers 0,1,2,3. Any thoughts on this approach?
Reading lists may be simplified by utilizing bit shifting to quickly determine the value of an additional element. It's a matter of personal preference and efficiency for both the reader and the author.
Utilizing shifts allows for the combination of multiple states into a single value. For example, a combined value of 6 can represent being both Errored and ChecksEnabled.
var combined = ViewState.ChecksEnabled | ViewState.Errored;
var isChecksEnabled = (combined & ViewState.ChecksEnabled) == ViewState.ChecksEnabled;
// alternatively
var isChecksEnabled = !!(combined & ViewState.ChecksEnabled);
This enumeration represents the concept of four flags, each capable of being either activated or deactivated. By combining the desired values using a logical OR operation, you can assign a specific value to the enum. For instance:
z = ViewState.FirstCheck | ViewState.ChecksEnabled
Subsequently in the code, you can independently assess these values by performing a logical AND operation with the desired flag:
if (z & ViewState.FirstCheck) {
do_something();
}
if (z & ViewState.ChecksEnabled) {
do_something_else();
}
The best way to ensure clear separation and identification of individual flags within the enum value is to assign them as powers of two.
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